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Quantum Information and Measurement (QIM)

Nonreciprocity with a Nonlinear Superconducting Circuit

Andrés Rosario Hamann, Clemens Müller, Markus Jerger, Joshua Combes, Thomas M. Stace, Arkady Fedorov, Maximilian Zanner, Martin P. Weides, Mikhail Pletyukhov

Published Jan 1, 2019• 0 citations
Publisher

Abstract

Nonreciprocal devices are fundamental for signal routing and noise isolation, however, they are bulky and inherently lossy. Here, we experimentally realize a minimal, passive nonreciprocal device by embedding two superconducting artificial atoms in a waveguide.
DOI
10.1364/qim.2019.f5a.58

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Abstract Nonreciprocal devices, such as isolator or circulator, are crucial for information routing and processing in quantum networks. Traditional nonreciprocal devices, which rely on the application of bias magnetic fields to break time‐reversal symmetry and Lorentz reciprocity, tend to be bulky and require strong static magnetic fields. This makes them challenging to implement in highly integrated large‐scale quantum networks. Therefore, a multifunctional nonreciprocal quantum device based on the integration and tunable interaction of superconducting quantum circuit (SQC) is designed. This device can switch between two‐port isolator, three‐port symmetric circulator, and antisymmetric circulator under the control of external magnetic flux. Furthermore, both isolator and circulator can achieve nearly perfect unidirectional signal transmission. It is believed that this scalable and integrable nonreciprocal device can provide new insight for the development of large‐scale quantum networks.